USB modem diagnostics
Hello,
I setup a Pantech UML295 USB modem on WatchGuard Firebox T15 for Internet redundancy many years ago, and I am trying to troubleshoot it now remotely, because the users were not able to connect to Internet when the main Internet connection went down.
So, I use Network tab of Diagnostics page in WebUI to
ping -I eth0 8.8.8.8
and I get
PING 8.8.8.8 (8.8.8.8) from "IP address" eth0: 56(84) bytes of data...
and when I do
ping -I modem0 8.8.8.8
I get
PING 8.8.8.8 (8.8.8.8) from "IP address" modem0: 56(84) bytes of data...
and I get replies both times, but I am confused seeing the same "from IP address" of the main Internet connection of interface eth0, when I am actually trying to ping using modem0 interface.
I suppose this is probably normal behavior, just want to confirm.
Aslo, the USB modem has Red light on it. Can someone remind me if this is because it is just a backup connection and does not pass the traffic when the main connection is up?
Thanks.
Comments
The support suggested to create an SD-WAN based ICMP policy for one of the computers behind the firewall to test the Internet connection through the modem interface.
This showed that the modem connection is passing ICMP traffic from test computer successfully, which means it is up and running, although the modem has a red light on it.
Hi @maestro
How the firewall handles traffic from your clients will depend on whether the firewall is detecting the upstream ISP device (your normal ISP.) By default, we recommend using something other than your default gateway (since the ISP device will almost always reply via that IP, even if the connection is down.)
You'll need to check with the USB modem manufacturer to find out what the red light indicates.
The manual here:
https://scache.vzw.com/multimedia/mim/vzw_uml295/UML295_Manual.pdf
suggests that the device is not connecting.